delt injections...
I have shot 1.5 cc of test/fina into my delts before w/ the 5/8" 25g without a problem. My only comment is not to go too far back on your delt,(towards your rear delt/shoulder blade), if you go to far back you WILL HIT A VEIN. I did this just the other day and it jumped the shit out of me! I aspirated prior to injecting and there was a single drop of blood, I figured I was near an old site so there was some old blood. Ohh noo!! I went thru a vein! When I pulled the pin out it was a freakin gyser of blood!! I thought I went thru an artery!! So I held pressure on it for a bout 5 min, the minimum for artery puncture, and while I was doing this my wife came downstairs. I told her what I did and she just laughed! She says," That used to happen to me all the time when injecting patients, don't worry.", She is a lab manager, former medical assistant who did pt. injections.
Moral of the story, stay a little back of the center line of your delt and you'll be fine; always aspirate before injecting!